Sumner, Claude. <br/><br/>
Ethiopian Philosophy :  Volume II The treatise of Zar'a  Ya'eqob and of Walda Heywat Text and Authorship / 
by Claude Summer, Ph.D. 
 - Addis Ababa :  Commercial printing Press,  1976. 
 - ix, 352 p. ;  24 cm. 
<br/><br/><label>Dewey Class. No.: </label>ETH 100.63 Sum 1976 V.II